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9.Arduino learning notebook--Photocontrolled LED experimentJuvtmall ( a company supply PCB Prototyping, PCBA service and sell kinds of components, modules and so on) ( Catduino has the same function of Arduino) The photosensitive resistor is also called the light pipe, and the commonly used materials are cadmium sulfide, as well as selenium, aluminum sulfide, lead sulphide and bismuth sulfide.These materials have a characteristic in which the resistance of the fabric is rapidly reduced at a given wavelength from the light. This is because the carrier of the light is involved in the conduction, in the role of external electric field drift movement,so that the resistance of the photosensitive resistor decreased rapidly. The working principle of photosensitive resistance is based on the internal photoelectric effect.At both ends of the semiconductor photosensitive material, the electrode wire is installed, which is encapsulated in the tube shell with a transparent window to form the photos…

Atmega8 is the cheapest of the arduino's officially supported chips, so we'll take it to explain how to make the arduino minimum system on the breadboard. Prepare the material 1. One Atmega8 DIP packaging chip 2.One 16MHz Crystal Oscillator 3. Two 22P capacitors One key, One breadboard and some connected wires. Let's look at this chip